Bug 2520902

Summary: CVE-2026-53791 rsync: rsync < 3.5.0 Daemon IP Spoofing via PROXY Protocol Header [fedora-all]
Product: [Fedora] Fedora Reporter: Srikanth Balasubramanian <sbalasub>
Component: rsyncAssignee: Michal Ruprich <mruprich>
Status: CLOSED ERRATA QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: luhliari, mruprich, ssorce
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["3a81e225-f9de-46c6-8591-65e95f755587"]}
Fixed In Version: rsync-3.5.0-1.fc44 rsync-3.5.0-1.fc43 Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-08-22 01:24:56 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2515387    

Description Srikanth Balasubramanian 2026-08-21 07:55:16 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

rsync daemon before 3.5.0 contains an IP address spoofing vulnerability that allows unauthenticated remote attackers to bypass IP-based access controls by sending a crafted PROXY protocol header with a forged source address. Attackers who can connect directly to the rsync daemon can inject a spoofed source IP in the PROXY protocol header to circumvent hosts allow/deny rules, gaining unauthorized access that would otherwise be blocked based on their real source address.
Comment 1 Fedora Update System 2026-08-21 08:09:25 UTC 
FEDORA-2026-d6763b4c84 (rsync-3.5.0-1.fc43) has been submitted as an update to Fedora 43.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-d6763b4c84
Comment 2 Fedora Update System 2026-08-21 08:09:51 UTC 
FEDORA-2026-bfae8723e2 (rsync-3.5.0-1.fc44) has been submitted as an update to Fedora 44.
https://bodhi.fedoraproject.org/updates/FEDORA-2026-bfae8723e2
Comment 3 Fedora Update System 2026-08-22 01:24:56 UTC 
FEDORA-2026-bfae8723e2 (rsync-3.5.0-1.fc44) has been pushed to the Fedora 44 stable repository.
If problem still persists, please make note of it in this bug report.
Comment 4 Fedora Update System 2026-08-27 01:11:40 UTC 
FEDORA-2026-d6763b4c84 (rsync-3.5.0-1.fc43) has been pushed to the Fedora 43 stable repository.
If problem still persists, please make note of it in this bug report.